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Original question:

TPS563200: IC Gets Damaged for Minimum Load of 500mA

TPS563200: Input Range and Low Side FET Failure

Sadashivan M
Prodigy 20 points
Part Number: TPS563200

Hi Team,

Reference to the previous discussions, https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1267943/tps563200-ic-gets-damaged-for-minimum-load-of-500ma/4803686#4803686 we had rerouted the PCB and the design worked for around 100 hours.

Testing: Input 12V2A, Output 5V3A. Tested for 100 Hours. 

Input: Lab Power Source, Output: Lab DC Load

The design from the TI webench was for an input range for 11.5V to 12.5V.

When the input voltage falls below 11.5V, the Low Side FET gets shorted. Falls below meaning, the Low Side FET gets shorted when the input voltage is for example, 11.45V (or lower).

We went back the WeBench and tried to adjust the range to 11.0V to 12.5V. For this change, there was no change with respect to the components.

Question #1: How do we make sure the TPS563200 can operate in a wider input range (for example, 10.5V to 12.5V).

Question #2: Any possibility of disabling the TPS563200 functionality when the input voltage range is outside the 'design range'. We did explore the EN pin, but want the suggestion from the experts on the best way to handle the above range (10.5V to 12.5V) without damaging the TPS563200 module.

Regards,

Sadashivan

  • 0
    TI__Expert 3900 points

    Hi Sadashivan,

    1. Webench is a reference design software that aims to help customers complete design solutions conveniently and quickly. So it will follow a universal principle. The component configuration will not change just because you slightly change the Vin voltage.
    2.The main control loop of the TPS563200 are adaptive on-time pulse width modulation (PWM) controller that supports a proprietary D-CAP2 control scheme. The D-CAP2 control scheme combines adaptive on-time control with an internal compensation circuit for pseudo-fixed frequency. Simply, TPS563200 is with  4.5-V to 17-V input voltage, it has adaptive on-time control , can regulate stably within the input voltage range.
    3.Does the "design range" you mentioned refer to 10.5V to 12.5V? If so, I suggest you improve the output accuracy of the upper-level power supply or add a judgment protection function to the upper-level power supply to ensure that its output does not exceed this range (10.5V to 12.5V). It should be emphasized that the input voltage of 10.5V to 12.5Vin will not cause damage to the TPS563200 . The chip has been on the market very early. From our large number of verification tests and actual application feedback from customers, its reliability is very high, so more consideration should be given to improve the layout placing.

    Best regards,

    Zhou